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    • 10. 发明申请
    • ZOOM LENS SYSTEM
    • 变焦镜头系统
    • US20120147480A1
    • 2012-06-14
    • US13391668
    • 2010-08-13
    • Junichi FujisakiTakashi EnomotoTomoya Koga
    • Junichi FujisakiTakashi EnomotoTomoya Koga
    • G02B15/14
    • G02B15/177
    • The objective of the present invention is to provide a zoom lens system having an f-number of approximately 1.3 at the wide extremity, a half angle-of-view of 75 degrees, and a zoom ratio of approximately 3:1. The solution to this objective is to provide a zoom lens system including a first lens group, having a negative refractive power, a diaphragm, and a second lens group, having a positive refractive power, in that order from the object side; wherein the first lens group and the second lens group move in the optical axis direction so that the distance therebetween decreases upon zooming from the wide-angle extremity to the telephoto extremity,
    • 本发明的目的是提供一种变焦透镜系统,其在宽端具有约1.3的f数,75度的半视角和大约3:1的变焦比。 该目的的解决方案是从物体侧依次提供具有正折光力的具有负折光力的第一透镜组,第二透镜组和第二透镜组的变焦透镜系统; 其中所述第一透镜组和所述第二透镜组在所述光轴方向上移动,使得在从所述广角端到远摄端的变焦时,所述第一透镜组和所述第二透镜组之间的距离减小,